iphone - 在xcode中单击后退按钮时加载tabbarcontroller？

Question

当我单击后退按钮时，我正在加载一个特定的视图。但是对于那个特定的视图，我必须添加一个 tabbarController。我该怎么做..？当我尝试添加它时，它没有被添加..无法理解 y ？

 -(IBAction)switchtofirst {
AppViewController *first=[[AppViewController alloc] initWithNibName:@"AppViewController" bundle:nil];  
        Login *second=[[Login alloc]initWithNibName:@"Login" bundle:nil];
        second.title=@"Login";
        NSArray *viewArray=[[NSArray alloc] initWithObjects: first,second,nil];
        tabBarController=[[UITabBarController alloc] init];
        [tabBarController setViewControllers:viewArray animated:NO];
        AppViewController *gp=[AppViewController alloc];
         [gp.view addSubview:tabBarController.view]; 
      [self presentModalViewController:gp animated:NO];
        [gp release];
         }

Answer 1

尝试这样的事情：

-(IBAction)switchtofirst {

    AppViewController *first = [[AppViewController alloc] initWithNibName:@"AppViewController" bundle:nil];
    Login *second=[[Login alloc]initWithNibName:@"Login" bundle:nil];
    second.title=@"Login";

    NSArray *viewArray= [NSArray arrayWithObjects:first, second, nil];

    tabBarController=[[UITabBarController alloc] init];
    [tabBarController setViewControllers:viewArray animated:NO];

    [self presentViewController:tabBarController animated:YES completion:nil];
}